È»ºó¾ö¶¨¼«¶ÔÊý£©¡£
A1X1A2X2
(a)
ͼ30
(b)
3 ÓÐһ̨Á½¼«Òþ¼«Ê½Í¬²½·¢µç»ú£¬×ª×ÓÉϹ²ÓÐ20¸ö²Û£¬·ÅÖõ¥²ãͬÐÄʽÈÆ×飬Èçͼ31Ëùʾ£¬Ã¿¸öÏßȦÓÐ10ÔÑ£¬ÏßȦȫ²¿´®Áª¡£ÊÔÇó£º £¨1£©µ±Ö±Á÷Àø´ÅµçÁ÷If=150AʱµÄ´Å¶¯ÊÆ·Ö²¼ÇúÏߣ» £¨2£©Ã¿¼«´Å¶¯ÊƵķùÖµ£»ËüµÄ»ù²¨·ùÖµºÍËüµÄÈý´Îг²¨·ùÖµ¡£
131360N?131360?S ͼ31
4 ijËļ«½»Á÷µç»ú¶¨×ÓÈýÏàË«²ãÈÆ×éµÄÿ¼«Ã¿Ïà²ÛÊýq=3£¬Ã¿¸öÏßȦÔÑÊýwc=2£¬ÏßȦ½Ú¾ày1=7²Û£¬²¢ÁªÖ§Â·ÊýΪ1£¬aÏàºÍbÏàÈÆ×é·Ö±ð½Óµ½¸÷×ԵĵçÔ´ÉÏ£¬²¢Ê¹ia=20sin?tA£¬
ib=-10sin(?t-60)A£¬ cÏ࿪·£¬ic=0A£¬ÊÔÇó³ö²úÉú»ù²¨ºÏ³É´Å¶¯ÊƵÄ×î´ó¡¢×îС·ùÖµ£¬
o¼°Æä¶ÔÓ¦µÄλÖ㬣¬ËµÃ÷ºÏ³É´Å¶¯ÊƵÄÐÔÖÊ¡£
Ï°ÌâÊ®Áù ͬ²½·¢µç»úµÄµçÊà·´Ó¦ Ò»¡¢Ë¼¿¼Ìâ
1 һ̨תÊàʽÈýÏàͬ²½·¢µç»ú£¬µçÊàÒÔתËÙnÄæʱÕëÐýת£¬Ö÷¼«´Å³¡¶ÔµçÊàÊÇʲôÐÔÖʵĴų¡£¿¶Ô³Æ¸ºÔØÔËÐÐʱ£¬µçÊà·´Ó¦´Å¶¯ÊÆÏà¶ÔÓÚµçÊàµÄתËÙºÍתÏòÈçºÎ£¿¶Ô¶¨×ÓÉÏÖ÷´Å¼«µÄÏà¶ÔתËÙÓÖÊǶàÉÙ£¿Ö÷¼«ÈÆ×éÄܸÐÓ¦³öµç¶¯ÊÆÂð£¿
2 ¸ºÔØʱͬ²½·¢µç»úÖеçÊà´Å¶¯ÊÆÓëÀø´Å´Å¶¯ÊƵķùÖµ¡¢Î»Öá¢×ªËÙÓÉÄÄЩÒòËØÀ´¾ö¶¨£¿ ?¡¢I?µÈÎïÀíÁ¿ÄÄЩÊÇ¿Õ¼äʸÁ¿£¿ÄÄЩÊÇʱ¼ä3 ÊÔ˵Ã÷ͬ²½µç»úÖеÄFf1¡¢Fa¡¢B0¡¢Ba¡¢E0ÏàÁ¿£¿ÊÔÊöÁ½ÖÖʸ£¨ÏࣩÁ¿Ö®¼äµÄͳһÐÔ¡£Èç¹û²»°ÑÏàÖáºÍʱÖáÖغϣ¬ÄÇôʱ¡¢¿ÕÏࣨʸ£©
Á¿Ö®¼äµÄ¹ØϵÔõÑù£¿
17
4 ͹¼«Í¬²½·¢µç»úÔÚ0<90o¸ºÔØÏÂÔËÐÐʱ,ÔÚʸÁ¿Í¼ÖУ¬ÆäµçÊà´Å³¡µÄ»ù²¨ºÍµçÊà´Å¶¯ÊÆÊÇ·ñÏàͬ£¿ÎªÊ²Ã´£¿ÔÚÒþ¼«µç»úÖÐÓÖÔõÑù£¿
5 ͬ²½µç»úµÄµçÊà·´Ó¦ÐÔÖÊÊÇÓÉʲô¾ö¶¨µÄ£¿ÈýÏà¶Ô³ÆµçÈÝÐÔ¸ºÔØϵçÊà·´Ó¦ÊÇ·ñÒ»¶¨ÊÇÖú´ÅÐÔÖʵģ¿
¶þ¡¢×÷ͼÌâ
1 ÓÐһ̨ͬ²½µç»ú£¬¶¨×ÓÈÆ×éÀïµç¶¯Êƺ͵çÁ÷µÄÕý·½ÏòÒѱê³ö£¬Èçͼ32Ëùʾ¡£
?µÄÏàÁ¿£¬²¢°ÑÕâ¸ö˲¼äת×ÓλÖûÔÚͼÀï¡£ £¨1£©»³öµ±?=120o˲¼ä£¬µç¶¯ÊÆE0£¨2£©Èô¶¨×ÓµçÁ÷ÂäºóÓڵ綯ÊÆ60oµç½Ç¶È£¬»³ö¶¨×ÓÈÆ×é²úÉúµÄºÏ³É»ù²¨´Å¶¯ÊÆFaµÄλÖᣠ£¨3£©Èç¹ûFa=
13Ff1£¬»³ö´Å¶¯ÊÆF?µÄλÖÃÀ´¡£
?AYCA?AX??Z0?BFf1
ͼ32
2 ÓÐһ̨ͬ²½·¢µç»ú£¬¶¨×ÓÈÆ×éÀïµç¶¯Êƺ͵çÁ÷µÄÕý·½Ïò·Ö±ð±êÔÚͼ33£¨a£©¡¢£¨b£©¡¢£¨c£©¡¢
?90µç½Ç¶È¡£¸ù¾Ýͼ£¨a£©£¨d£©Àï¡£¼ÙÉ趨×ÓµçÁ÷ÁìÏȵ綯ÊÆE¡¢£¨b£©¡¢£¨c£©ºÍ£¨d£©ËùʾµÄ0o?¡¢I?ÏàÁ¿ºÍF¡¢FʸÁ¿¡£²¢ËµÃ÷ÊÇÈ¥´Å»¹ÊÇÖú´ÅÐÔÖÊ¡£ ת×ÓλÖã¬×÷³öE0af1YSCµçÊÆ¡¢ µçÁ÷Õý·½ÏòYSCn1AXAn1XNZBZNB
(a) (b)
µçÁ÷Õý·½ÏòµçÊÆÕý·½ÏòYSCµçÊÆÕý·½ÏòµçÁ÷Õý·½ÏòYSCn1An1XAXNNZBZB
18
(c) (d)
ͼ33
3 ÒÑ֪һ̨Òþ¼«Í¬·¢µç»úµÄ¶ËµçѹU?=1£¬µçÁ÷I?=1£¬Í¬²½µç¿¹X·¢µç»ú¹ßÀý£©¡£
?I?s=1ºÍ¹¦ÂÊÒòÊýcos?=1
£¨ºöÂÔ¶¨×Óµç×裩£¬Óûʱ¿ÕÏࣨʸ£©Á¿Í¼µÄ°ì·¨ÕÒ³öͼ34Ëùʾ˲¼äͬ²½µç»úת×ÓµÄλÖã¨ÓÃ
?A?t?E0¡« ?UXS?U
ͼ34
4 ÓÐһ̨ÐýתµçÊàµÄͬ²½µç»ú£¬µç¶¯ÊÆ¡¢µçÁ÷µÄÕý·½ÏòÈçͼ35Ëùʾ¡£
?¡¢?¡¢E£¨1£©µ±×ª×Óתµ½Í¼35Ëùʾ˲¼ä£¬»³öÀø´Å´Å¶¯ÊÆFf1ÔÚµçÊàÈÆ×éÀï²úÉúµÄµç¶¯ÊÆEOAOB?µÄʱ¼äÏàÁ¿Í¼£» EOCo?¡¢E?ºÍE?£¨2£©ÒÑÖªµçÊàµçÁ÷I?A¡¢I?BºÍI?CºÍ·Ö±ðÂäºóµç¶¯ÊÆEOAOBOC60µç½Ç¶È£¬»³öµç
Êà·´Ó¦ºÏ³É»ù²¨´Å¶¯ÊÆFaÀ´£»
£¨3£©Çó³ö´Å¶¯ÊÆFaÏà¶ÔÓÚ¶¨×ÓµÄתËÙΪ¶àÉÙ£¿
NYCAZSXBn1 ͼ35
Ï°ÌâÊ®Æß Í¬²½·¢µç»ú»ù±¾µç´Å¹Øϵ Ò»¡¢Ë¼¿¼Ìâ
1 ¶Ô³Æ¸ºÔØʱ£¬Í¬²½µç»ú¶¨×ÓµçÁ÷½¨Á¢µÄµçÊàÐýת´Å³¡ÊÇ·ñ½»Àø´ÅÈÆ×飿ËüÔÚÀø´ÅÈÆ×éÖиÐÓ¦µç¶¯ÊÆÂð£¿ÎªÊ²Ã´£¿ 2
°´ÕÕÇиîµç¶¯ÊƸÅÄîÔÚ´ÅÃÜ×î´ó´¦µ¼Ï߸ÐÓ¦µç¶¯ÊÆÒ²×î´ó£¬ÔòʸÁ¿B0ÓëʸÁ¿E0ºÃÏóÊÇ
19
?ÂäºóÓëB90?£¬ÕâÔõô´ÓÎïÀí¸ÅÄîÀ´½âͬÏàλµÄ£¬Ó¦¸ÃÖغϣ¬µ«Êµ¼Êʱ¿ÕÏàÁ¿Í¼ÖÐÈ´ÊÇE00ÊÍ£¿
3 ͬ²½µç»ú´ø¶Ô³ÆÔËÐÐʱ£¬Æø϶´Å³¡ÊÇÓÉÄÄЩ´Å¶¯Êƽ¨Á¢µÄ£¬ËüÃǵÄÐÔÖʺ͹ØϵÈçºÎ£¿ 4 ΪºÎͬ²½µç»úÔڶԳƸºÔØÏÂÔËÐÐʱ£¬Ã¿ÏàµçÁ÷ÂäºóÓÚ¸ÃÏàÀø´Åµç¶¯ÊƵÄʱ¼ä½Ç¶È¾ÍµÈÓÚµçÊà´Å¶¯ÊÆÂäºóÓÚ½»ÖáµÄ¿Õ¼äµç½Ç¶È£¿Èç¹ûÈýÏàµçÁ÷²»¶Ô³Æ£¬´Ë½áÂÛÊÇ·ñ³ÉÁ¢£¿ 5
?µÄ¼Ð½Ç?Ϊһ¸öÈñ½Ç£¿ÕâÒ»½Ç¶ÈÊÇÓÉʲô¾ö¶¨ÔÚʲôÇé¿öÏ£¬Í¬²½·¢µç»úµÄI?ÓëE0µÄ£¿ 6
¶ÔÓ¦ÓÚͬ²½µç¿¹µÄ´Åͨ°üº¬ÓÐÄÄÁ½¸ö×é³É·ÖÁ¿£¿Ã¿Ïàͬ²½µç¿¹ÓëÿÏàÈÆ×é±¾ÉíµÄÀø´Åµç¿¹ÓÐʲôÇø±ð£¿ÎªÊ²Ã´ËµÍ¬²½µç¿¹ÊÇÓëÈýÏàÓйصĵ翹¶øËüµÄÊýÖµÓÖÊÇÿÏàÖµ£¿
¶þ¡¢¼ÆËãÌâ
1 ÓÐһ̨ͬ²½·¢µç»ú£¬SN=16667kVA £¬UN=13800V£¨Y½ÓÏߣ©cos?=0.8(Öͺó)£¬µçÊà©¿¹
?±êçÛÖµx?=0.24,µçÊàµç×èºöÂÔ²»¼Æ¡£¶ÔÓ¦ÓڶµçÁ÷µÄµçÊà·´Ó¦´Å¶¯ÊƹéËãΪÀø´ÅµçÁ÷
Ifa=1.35A,¿ÕÔØÌØÐÔΪ:
E0 ?0£®25 45 0£®45 85 0£®79 150 1£®00 205 1£®14 250 1£®20 300 1£®25 350 If£¨A£© ÊÔÓõ綯ÊÆ¡ª¡ª´Å¶¯ÊÆÏàÁ¿Í¼Çó¸Ã·¢µç»úµÄ¶î¶¨Àø´ÅµçÁ÷ºÍµçѹµ÷ÕûÂÊ¡££¨ÓÃ×ø±êÖ½×÷ͼ£© 2 һ̨Òþ¼«Í¬²½·¢µç»úÔËÐÐÓں㶨µçѹÏ£¬ÆäÀø´Å¿ÉËæʱµ÷Õû£¬Ê¹ÆäÏ߶˹¦ÂÊÒòÊýÔÚ²»Í¬Çé¿öϾ³£µÈÓÚ1£¬ÊÔµ¼³ö´ËʱµçÊàµçÁ÷IºÍÀø´Åµç¶¯ÊÆE0Ö®¼äµÄ¹Øϵ¡£ 3 һ̨ÈýÏàÆûÂÖ·¢µç»úSN=30000kVA£¬UN =11000V£¬IN=1570A,Y½Ó·¨¡£ (1) xs=2.35£¬ÓÃÏàÁ¿Í¼Çó³öcos?=0.855(Öͺó)ʱI=INµÄ?½ÇºÍ?½Ç¡£
(2) x?=0.661?£¬ra²»¼Æ£¬»³öcos=0.5(³¬Ç°) ʱµÄµç¶¯ÊÆÏàÁ¿Í¼£¬²¢Çó³öE?EaºÍE0 4 ÉèÓÐÒ»Òþ¼«Ê½Í¬²½·¢µç»úÔÚijÖÖÇé¿öÏÂת×Ӵż«´Å³¡µÄÕñ·ùºÍ¶¨×Ӵų¡µÄÕñ·ùÊÊÏàµÈ£¬·¢µç»úµÄ¶ËµçѹΪÿÏà3000V£¬ÂÔÈ¥µç×輰©¿¹£¬ÊÔÇóµ±¹¦ÂÊÒòÊý½Ç?= 30¼°??60ʱµÄ¿ÕÔص綯ÊÆ¡£
5 ÒÑ֪һ̨͹¼«Í¬²½µç»úU*=1£¬I*=1£¬Xd*=0.6 ,£òa ?0, ?= 20?(ÁìÏÈ),µ±t=0ʱ,uA×î´ó¡£
? £¨1£©Óõ綯ÊÆÏàÁ¿Í¼ÇóEA0?0£¨2£©ÅжϵçÊà·´Ó¦ÊÇÈ¥´Å»¹ÊÇÖú´Å¡£
20